Strong interband Faraday rotation in 3D topological insulator Bi2Se3

L. Ohnoutek, M. Hakl, M. Veis, B. A. Piot, C. Faugeras, G. Martinez, M. V. Yakushev, R. W. Martin, C. Drasar, A. Materna, G. Strzelecka, A. Hruban, M. Potemski, M. Orlita

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Abstract

The Faraday effect is a representative magneto-optical phenomenon, resulting from the transfer of angular momentum between interacting light and matter in which time-reversal symmetry has been broken by an externally applied magnetic field. Here we report on the Faraday rotation induced in the prominent 3D topological insulator Bi2Se3 due to bulk interband excitations. The origin of this non-resonant effect, extraordinarily strong among other non-magnetic materials, is traced back to the specific Dirac-type Hamiltonian for Bi2Se3, which implies that electrons and holes in this material closely resemble relativistic particles with a non-zero rest mass.
Original languageEnglish
Article number19087
Number of pages9
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 11 Jan 2016

Keywords

  • Faraday rotation
  • 3D topological insulator
  • Bi3Se3
  • time reversal symmetry

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